New answers tagged popular-science
The direction of the force due to surface tension depends on whether the liquid wets the the body or not. In the first picture liquid does not wet the body, so the force is directed in such a way as to decrease the contact surface area of the body with the liquid. That is, upwards. In the second picture liquid wets the body, so the force is directed in ...
Draw two circles on a piece of paper and poke holes in both of them fold the paper to where a pencil can fit through the two holes you have created. This shows how a black hole works and it is a fun thing to do with kids who are interested in this subject, like myself. And i'm only 13 and I get it.
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